Prior self-validation hypothesis studies suggest that an individual’s attitude toward advertising is affected by the cognitive processing of the message and the valence of emotion. Yet, the effect of emotional arousal and stimulus credibility on attitudes toward a destination has not been discerned. This study employs the self-validation hypothesis to investigate the effect of the three dimensions of thinking on attitudes toward Iran. Participants (N = 416) were randomly assigned to a two (high vs. low arousal) × two (high vs. low source credibility) experiment. The partial least squares multigroup analysis results indicated that the emotionally arousing stimulus led to a greater influence of the amount and confidence of thought on attitudes. The effect of the amount of thought on attitude was greater in response to a credible stimulus. This research advances knowledge by revealing that emotional arousal has a significant positive impact on three dimensions of thinking and positive attitudes.